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Related Concept Videos

Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

3.5K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
3.5K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

4.7K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
4.7K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.8K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
3.8K
Structure of Amines01:19

Structure of Amines

3.3K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are...
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Amines: Introduction01:07

Amines: Introduction

5.7K
Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively.
5.7K
Nomenclature of Primary Amines01:17

Nomenclature of Primary Amines

4.5K
Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.
4.5K

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Amine-Borane Dehydropolymerization: Challenges and Opportunities.

Annie L Colebatch1,2, Andrew S Weller2

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 20, 2018
PubMed
Summary
This summary is machine-generated.

Polyaminoboranes, inorganic analogues of polyolefins, are synthesized via amine-borane dehydropolymerization. This review covers recent advances in catalysts, mechanisms, and applications for these novel polymeric materials.

Keywords:
amine-boranecatalysisdehydrogenationdehydropolymerizationpolyaminoborane

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Area of Science:

  • Polymer Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Polyaminoboranes are inorganic polymers with alternating main-chain B-N units.
  • They are structural analogues to polyolefins, offering potential for new material properties.
  • The synthesis and characterization of these polymers present unique chemical challenges and opportunities.

Purpose of the Study:

  • To review recent advancements in the dehydropolymerization of amine-boranes.
  • To discuss catalyst development, mechanistic insights, and alternative synthesis routes.
  • To outline the properties, applications, and future directions for polyaminoboranes.

Main Methods:

  • Catalyst screening and performance evaluation for dehydropolymerization.
  • Mechanistic studies to understand reaction pathways.
  • Characterization of resulting polyaminoborane properties and exploration of applications.

Main Results:

  • Significant progress in catalyst development for efficient polyaminoborane synthesis.
  • Elucidation of key mechanistic aspects governing the dehydropolymerization process.
  • Demonstration of diverse substrate scope and tunable polymer properties.

Conclusions:

  • Dehydropolymerization of amine-boranes is a promising route to novel inorganic polymers.
  • Further research into catalysis, mechanisms, and applications will drive the field forward.
  • Polyaminoboranes hold potential for advanced material applications.